package core

import (
	"encoding/hex"
	"fmt"

	libcommon "github.com/ledgerwatch/erigon-lib/common"
	"github.com/ledgerwatch/erigon-lib/common/hexutility"

	"github.com/ledgerwatch/erigon/common"
	"github.com/ledgerwatch/erigon/core/systemcontracts"
	"github.com/ledgerwatch/erigon/params"
	"github.com/ledgerwatch/erigon/params/networkname"
)

func init() {
	// Initialise systemContractCodeLookup
	for _, chainName := range []string{networkname.BorMainnetChainName, networkname.MumbaiChainName, networkname.BorDevnetChainName} {
		byChain := map[libcommon.Address][]libcommon.CodeRecord{}
		systemcontracts.SystemContractCodeLookup[chainName] = byChain
		// Apply genesis with the block number 0
		genesisBlock := GenesisBlockByChainName(chainName)
		for addr, alloc := range genesisBlock.Alloc {
			if len(alloc.Code) > 0 {
				list := byChain[addr]
				codeHash, err := common.HashData(alloc.Code)
				if err != nil {
					panic(fmt.Errorf("failed to hash system contract code: %s", err.Error()))
				}
				list = append(list, libcommon.CodeRecord{BlockNumber: 0, CodeHash: codeHash})
				byChain[addr] = list
			}
		}
		// Process upgrades
		chainConfig := params.ChainConfigByChainName(chainName)
		if chainConfig.Bor != nil && chainConfig.Bor.CalcuttaBlock != nil {
			blockNum := chainConfig.Bor.CalcuttaBlock.Uint64()
			if blockNum != 0 {
				addCodeRecords(systemcontracts.CalcuttaUpgrade[chainName], blockNum, byChain)
			}
		}
	}

	addGnosisSpecialCase()
}

// some hard coding for gnosis chain here to solve a historical problem with the token contract being re-written
// and losing the history for it in the DB.  Temporary hack until erigon 3 arrives
func addGnosisSpecialCase() {
	byChain := map[libcommon.Address][]libcommon.CodeRecord{}
	systemcontracts.SystemContractCodeLookup[networkname.GnosisChainName] = byChain
	address := libcommon.HexToAddress("0xf8d1677c8a0c961938bf2f9adc3f3cfda759a9d9")
	list := byChain[address]

	oldContractCode := hexutility.FromHex("0x6080604052600436106101b65763ffffffff7c010000000000000000000000000000000000000000000000000000000060003504166305d2035b81146101bb57806306fdde03146101e4578063095ea7b31461026e5780630b26cf661461029257806318160ddd146102b557806323b872dd146102dc57806330adf81f14610306578063313ce5671461031b5780633644e51514610346578063395093511461035b5780634000aea01461037f57806340c10f19146103b057806342966c68146103d457806354fd4d50146103ec578063661884631461040157806369ffa08a1461042557806370a082311461044c578063715018a61461046d578063726600ce146104825780637d64bcb4146104a35780637ecebe00146104b8578063859ba28c146104d95780638da5cb5b1461051a5780638fcbaf0c1461054b57806395d89b4114610589578063a457c2d71461059e578063a9059cbb146105c2578063b753a98c146105e6578063bb35783b1461060a578063cd59658314610634578063d73dd62314610649578063dd62ed3e1461066d578063f2d5d56b14610694578063f2fde38b146106b8578063ff9e884d146106d9575b600080fd5b3480156101c757600080fd5b506101d0610700565b604080519115158252519081900360200190f35b3480156101f057600080fd5b506101f9610721565b6040805160208082528351818301528351919283929083019185019080838360005b8381101561023357818101518382015260200161021b565b50505050905090810190601f1680156102605780820380516001836020036101000a031916815260200191505b509250505060405180910390f35b34801561027a57600080fd5b506101d0600160a060020a03600435166024356107af565b34801561029e57600080fd5b506102b3600160a060020a0360043516610803565b005b3480156102c157600080fd5b506102ca61085d565b60408051918252519081900360200190f35b3480156102e857600080fd5b506101d0600160a060020a0360043581169060243516604435610863565b34801561031257600080fd5b506102ca610a32565b34801561032757600080fd5b50610330610a56565b6040805160ff9092168252519081900360200190f35b34801561035257600080fd5b506102ca610a5f565b34801561036757600080fd5b506101d0600160a060020a0360043516602435610a65565b34801561038b57600080fd5b506101d060048035600160a060020a0316906024803591604435918201910135610a78565b3480156103bc57600080fd5b506101d0600160a060020a0360043516602435610b89565b3480156103e057600080fd5b506102b3600435610c94565b3480156103f857600080fd5b506101f9610ca1565b34801561040d57600080fd5b506101d0600160a060020a0360043516602435610cd8565b34801561043157600080fd5b506102b3600160a060020a0360043581169060243516610db5565b34801561045857600080fd5b506102ca600160a060020a0360043516610df1565b34801561047957600080fd5b506102b3610e0c565b34801561048e57600080fd5b506101d0600160a060020a0360043516610e23565b3480156104af57600080fd5b506101d0610e37565b3480156104c457600080fd5b506102ca600160a060020a0360043516610e3e565b3480156104e557600080fd5b506104ee610e50565b6040805167ffffffffffffffff9485168152928416602084015292168183015290519081900360600190f35b34801561052657600080fd5b5061052f610e5b565b60408051600160a060020a039092168252519081900360200190f35b34801561055757600080fd5b506102b3600160a060020a0360043581169060243516604435606435608435151560ff60a4351660c43560e435610e6a565b34801561059557600080fd5b506101f9611171565b3480156105aa57600080fd5b506101d0600160a060020a03600435166024356111cb565b3480156105ce57600080fd5b506101d0600160a060020a03600435166024356111d7565b3480156105f257600080fd5b506102b3600160a060020a0360043516602435611202565b34801561061657600080fd5b506102b3600160a060020a036004358116906024351660443561120d565b34801561064057600080fd5b5061052f61121e565b34801561065557600080fd5b506101d0600160a060020a036004351660243561122d565b34801561067957600080fd5b506102ca600160a060020a03600435811690602435166112b4565b3480156106a057600080fd5b506102b3600160a060020a03600435166024356112df565b3480156106c457600080fd5b506102b3600160a060020a03600435166112ea565b3480156106e557600080fd5b506102ca600160a060020a036004358116906024351661130a565b60065474010000000000000000000000000000000000000000900460ff1681565b6000805460408051602060026001851615610100026000190190941693909304601f810184900484028201840190925281815292918301828280156107a75780601f1061077c576101008083540402835291602001916107a7565b820191906000526020600020905b81548152906001019060200180831161078a57829003601f168201915b505050505081565b336000818152600560209081526040808320600160a060020a03871680855290835281842086905581518681529151939490939092600080516020611a13833981519152928290030190a350600192915050565b600654600160a060020a0316331461081a57600080fd5b61082381611327565b151561082e57600080fd5b6007805473ffffffffffffffffffffffffffffffffffffffff1916600160a060020a0392909216919091179055565b60045490565b600080600160a060020a038516151561087b57600080fd5b600160a060020a038416151561089057600080fd5b600160a060020a0385166000908152600360205260409020546108b9908463ffffffff61132f16565b600160a060020a0380871660009081526003602052604080822093909355908616815220546108ee908463ffffffff61134116565b600160a060020a0380861660008181526003602090815260409182902094909455805187815290519193928916926000805160206119f383398151915292918290030190a3600160a060020a0385163314610a1c5761094d85336112b4565b905060001981146109b757610968818463ffffffff61132f16565b600160a060020a038616600081815260056020908152604080832033808552908352928190208590558051948552519193600080516020611a13833981519152929081900390910190a3610a1c565b60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	newContractCode := 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	codeHash, err := common.HashData(oldContractCode)
	if err != nil {
		panic("could not get code hash from old gnosis token contract")
	}
	list = append(list, libcommon.CodeRecord{
		BlockNumber: 0,
		CodeHash:    codeHash,
	})

	codeHash, err = common.HashData(newContractCode)
	if err != nil {
		panic("could not get code hash from new gnosis token contract")
	}
	list = append(list, libcommon.CodeRecord{
		BlockNumber: 21735000,
		CodeHash:    codeHash,
	})

	byChain[address] = list
}

func addCodeRecords(upgrade *systemcontracts.Upgrade, blockNum uint64, byChain map[libcommon.Address][]libcommon.CodeRecord) {
	for _, config := range upgrade.Configs {
		list := byChain[config.ContractAddr]
		code, err := hex.DecodeString(config.Code)
		if err != nil {
			panic(fmt.Errorf("failed to decode system contract code: %s", err.Error()))
		}
		codeHash, err := common.HashData(code)
		if err != nil {
			panic(fmt.Errorf("failed to hash system contract code: %s", err.Error()))
		}
		list = append(list, libcommon.CodeRecord{BlockNumber: blockNum, CodeHash: codeHash})
		byChain[config.ContractAddr] = list
	}
}
